The Diocese of Kilmacduagh is a Roman Catholic diocese located in County Galway, Ireland. It was established in the early Christian period and is known for its rich ecclesiastical history and heritage. The diocese is named after the ancient monastic site of Kilmacduagh, which features notable ruins, including a round tower and several churches. The diocese is part of the Archdiocese of Tuam and serves a diverse community of parishes. It plays a significant role in the spiritual and social life of the region, providing pastoral care and promoting various religious activities and education within its jurisdiction.